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• W2032912221 abstract "A redox model study of [NiFe] hydrogenase has examined a series of five polymetallics based on the metalation of the dithiolate complex [1,5-bis(mercaptoethyl)-1,5-diazacyclooctane]Ni(II), Ni-1. Crystal structures of three polymetallics of the series have been reported earlier: [(Ni-1)(2)()Ni]Cl(2)(), [(Ni-1)(2)()FeCl(2)()](2)(), and [(Ni-1)(3)()(ZnCl)(2)()]Cl(2)(). Two are described here: [(Ni-1)(2)()Pd]Cl(2)().2H(2)()Ocrystallizes in the monoclinic system, space group P2(1)/c with cell constants a = 12.212(4) Å, b = 7.642(2) Å, c = 16.625(3) Å, beta = 107.69(2) degrees, V = 1443.230(0) Å(3), Z = 2, R = 0.051, and R(w) = 0.056. [(Ni-1)(2)()CoCl]PF(6)() crystallizes in the triclinic system, space group P&onemacr;, with cell constants a = 8.14(2) Å, b = 13.85(2) Å, c = 15.67(2) Å, alpha = 113.59(10) degrees, beta = 101.84(14) degrees, gamma = 94.0(2) degrees, V = 1561.620(0)Å(3), Z = 2, R = 0.072, and R(w) = 0.077. In all Ni-1 serves as a bidentate metallothiolate ligand with a hinge angle in the range 105-118 degrees and Ni-M distances of 2.7- 3.7 Å. The most accessible redox event is shown by EPR and electrochemistry to reside in the N(2)S(2)Ni unit and is the Ni(II/I) couple. Charge neutralization of the thiolate sulfurs by metalation can (dependent on the interacting metal) stabilize the Ni(I) state as efficiently as methylation forming a thioether. The implication of these results for the heterometallic active site of [NiFe]-hydrogenase as structured from Desulfovibrio gigas (Volbeda, A., et al. Nature, 1995, 373, 580), the generality of the Ni(&mgr;-SR)(2)M hinge structure, and a possible explanation for the unusual redox potentials are discussed." @default.
• W2032912221 created "2016-06-24" @default.
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• W2032912221 date "1996-01-01" @default.
• W2032912221 modified "2023-10-16" @default.
• W2032912221 title "Influence of Sulfur Metalation on the Accessibility of the Ni^II/I Couple in [<i>N</i>,<i>N‘</i>-Bis(2-mercaptoethyl)-1,5-diazacyclooctanato]nickel(II): Insight into the Redox Properties of [NiFe]-Hydrogenase" @default.
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• W2032912221 doi "https://doi.org/10.1021/ic9515968" @default.
• W2032912221 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11666411" @default.
• W2032912221 hasPublicationYear "1996" @default.
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